unique_numbers.remove(¾) # 如果元素不存在会引发KeyError unique_numbers.discard(⅔) # 不存在时不引发异常 popped_number = unique_numbers.pop() # 删除并返回一个随机元素 unique_numbers.clear() # 清空集合2.2 可变类型的应用场景2.2.1 动态数据结构管理 可变类型适用于需要频繁调整数据结构的场景,如...
"new_string=remove_spaces(string)print(new_string) 1. 2. 3. 4. 5. 6. 7. 输出结果为: AI检测代码解析 Hello,World! 1. 删除数字 AI检测代码解析 defremove_numbers(str):return''.join(charforcharinstrifnotchar.isdigit())# 测试string="Hello123World456!"new_string=remove_numbers(string)print...
importtimeimportre# Define a large stringlarge_string='a'*1000000# Using replace()start_time=time.time()large_string.replace('a','')print(f"Time taken by replace():{time.time()-start_time}seconds")# Using re.sub()start_time=time.time()re.sub('a','',large_string)print(f"Time ta...
1#使用装饰器(decorator),2#这是一种更pythonic,更elegant的方法,3#单例类本身根本不知道自己是单例的,因为他本身(自己的代码)并不是单例的4defsingleton(cls,*args,**kw):5instances={}6def_singleton():7ifcls notininstances:8instances[cls]=cls(*args,**kw)9returninstances[cls]10return_singleton1...
filter()will return an iterator containing all of the numbers in the string, andjoin()will join all of the elements in the iterator with an empty string. Ultimately,Pythonstrings are immutable, so all of the mentioned methods will remove characters from the string and return a new string. ...
numbers.remove(numbers[0]) #remove the first item lastdigi = numbers[-1] for number in numbers: if number >= lastdigi: #removes all numbers >= last digi numbers.remove(number) break #and prints the rest listnum = len(numbers) #this whole section is to try and print the numbers from...
Python中有6个标准的数据类型:Number(数字)、String(字符串)、List(列表)、Tuple(元组)、Set(集合)、Dictionary(字典),每种类型有其固有的属性和方法,学会这六种数据类型及基础的方法,很多代码基本上都能看得懂,很多功能也都能实现了。要是实现面向百度编程到面向自己编程的转变,必须搞搞清楚这六大...
con = cx_Oracle.connect('pythonhol/welcome@127.0.0.1/orcl') ver = con.version.split(".") print ver print ver.index("1") ver.remove("2") print ver ver1 = ["11", "g"] ver2 = ["R", "2"] print ver1 + ver2 con.close() 在命令行终端重新运行该脚本: python connect.py ind...
数字型(Numbers) 字符串(String) 列表(List) 字典(Dict) 元祖(Tuple) 集合(Set) 1、数字型可大致分为 int、float、bool、complex int:长整数型,这里和Java不一样,没有对字节长度进行限制,也就是说,只要是整数的一些四则运算依然是int类型 float:浮点型,就是带小数点的,使用它的时候注意场景,因为精度有限。
etree.fromstring(rsp_data) namespaces = {'patch': 'urn:huawei:yang:huawei-patch'} elems = root_elem.find('patch:patch/patch:patch-infos/patch:patch-info', namespaces) node_dict = {} cur_pat_file = None if elems is not None: nslen = len(namespaces.get('patch')) for elem in ...